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ftrace: Implement cached modules tracing on module load
If a module is cached in the set_ftrace_filter, and that module is loaded,
then enable tracing on that module as if the cached module text was written
into set_ftrace_filter just as the module is loaded.
# echo ":mod:kvm_intel" >
# cat /sys/kernel/tracing/set_ftrace_filter
#### all functions enabled ####
:mod:kvm_intel
# modprobe kvm_intel
# cat /sys/kernel/tracing/set_ftrace_filter
vmx_get_rflags [kvm_intel]
vmx_get_pkru [kvm_intel]
vmx_get_interrupt_shadow [kvm_intel]
vmx_rdtscp_supported [kvm_intel]
vmx_invpcid_supported [kvm_intel]
[..]
Signed-off-by: Steven Rostedt (VMware) <[email protected]>
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